Hi Gary,
Hey, this is a Lotus.... Chapman used to complain when people put washers under bolt heads because of the extra weight, so there's no way he'd have fitted ornaments to add weight and spoil the drag factor
I think they were all dealer fitted, and has already been said the real life performance is variable. The previous owner of my car fitted two door mirrors and it just wasn't possible to adjust the passenger side with enough angle to see behind. They were vitaloni sebring copies, very trendy in the 70s. I now just have a single mirror on the driver's door which does work after a fashion, but coming from a modern car with two fully functional door mirrors, it's a culture shock.
The problem is that they are fitted very close to the door line so you can't get enough angle on the passenger side. Mounting on a small pillar to space it away from the door and tilt it slightly would be better, and a flexible mount (as on the Elise) I think would solve the problem entirely. I've recently been looking at the Vitaloni california mirrors as I think they would work, but was slightly discouraged by comments that they droop out of alignment - I need to see some in real life I think.
Brian